Trigonometry

There once was a great land called Trigonometry. In this land lived the good people: Sine, Cosine, and Tangent. There also lived the evil Cosecant, Secant, and Cotangent. One day, a great battle occured. They all fought for many a moon, until they realized that their powers were equal and opposite. They then formed the Allience of Trigonometric Functions, and spent the remainder of their lives helping people with triangles and plaguing young high school students.